#pragma once

#include <iostream>
#include <time.h>
#include <stdarg.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>

#define SIZE 1024

#define Info 0
#define Debug 1
#define Warning 2
#define Error 3
#define Fatal 4

#define Screen 1
#define Onefile 2
#define Classfile 3

#define LogFile "log.txt"

class Log
{
public:
  Log()
  {
    printMethod = Screen;
    path = "./log/";
  }
  void Enable(int method)
  {
    printMethod = method;
  }
  std::string levelToString(int level)
  {
    switch (level)
    {
    case Info:
      return "Info";
    case Debug:
      return "Debug";
    case Warning:
      return "Warning";
    case Error:
      return "Error";
    case Fatal:
      return "Fatal";
    default:
      return "None";
    }
  }

  // void logmessage(int level, const char *format, ...)
  // {
  //     time_t t = time(nullptr);
  //     struct tm *ctime = localtime(&t);
  //     char leftbuffer[SIZE];
  //     snprintf(leftbuffer, sizeof(leftbuffer), "[%s][%d-%d-%d %d:%d:%d]", levelToString(level).c_str(),
  //              ctime->tm_year + 1900, ctime->tm_mon + 1, ctime->tm_mday,
  //              ctime->tm_hour, ctime->tm_min, ctime->tm_sec);

  //     // va_list s;
  //     // va_start(s, format);
  //     char rightbuffer[SIZE];
  //     vsnprintf(rightbuffer, sizeof(rightbuffer), format, s);
  //     // va_end(s);

  //     // 格式：默认部分+自定义部分
  //     char logtxt[SIZE * 2];
  //     snprintf(logtxt, sizeof(logtxt), "%s %s\n", leftbuffer, rightbuffer);

  //     // printf("%s", logtxt); // 暂时打印
  //     printLog(level, logtxt);
  // }
  void printLog(int level, const std::string &logtxt)
  {
    switch (printMethod)
    {
    case Screen:
      std::cout << logtxt << std::endl;
      break;
    case Onefile:
      printOneFile(LogFile, logtxt);
      break;
    case Classfile:
      printClassFile(level, logtxt);
      break;
    default:
      break;
    }
  }
  void printOneFile(const std::string &logname, const std::string &logtxt)
  {
    std::string _logname = path + logname;
    int fd = open(_logname.c_str(), O_WRONLY | O_CREAT | O_APPEND, 0666); // "log.txt"
    if (fd < 0)
      return;
    write(fd, logtxt.c_str(), logtxt.size());
    close(fd);
  }
  void printClassFile(int level, const std::string &logtxt)
  {
    std::string filename = LogFile;
    filename += ".";
    filename += levelToString(level); // "log.txt.Debug/Warning/Fatal"
    printOneFile(filename, logtxt);
  }

  ~Log()
  {
  }
  void operator()(int level, const char *format, ...)
  {
    time_t t = time(nullptr);
    struct tm *ctime = localtime(&t);
    char leftbuffer[SIZE];
    snprintf(leftbuffer, sizeof(leftbuffer), "[%s][%d-%d-%d %d:%d:%d]", levelToString(level).c_str(),
             ctime->tm_year + 1900, ctime->tm_mon + 1, ctime->tm_mday,
             ctime->tm_hour, ctime->tm_min, ctime->tm_sec);

    va_list s;
    va_start(s, format);
    char rightbuffer[SIZE];
    vsnprintf(rightbuffer, sizeof(rightbuffer), format, s);
    va_end(s);

    // 格式：默认部分+自定义部分
    char logtxt[SIZE * 2];
    snprintf(logtxt, sizeof(logtxt), "%s %s", leftbuffer, rightbuffer);

    // printf("%s", logtxt); // 暂时打印
    printLog(level, logtxt);
  }

private:
  int printMethod;
  std::string path;
};

// int sum(int n, ...)
// {
//     va_list s; // char*
//     va_start(s, n);

//     int sum = 0;
//     while(n)
//     {
//         sum += va_arg(s, int); // printf("hello %d, hello %s, hello %c, hello %d,", 1, "hello", 'c', 123);
//         n--;
//     }

//     va_end(s); //s = NULL
//     return sum;
// }